Thermocouple welding method2

Thermocouple measurements usually adopt the method of welding formation, requires solid solder joint, the surface is smooth, free from contamination metamorphism and crack, solder joints as far as possible little, usually for two times the diameter of the hot wire electrode. Laboratory welding method mainly adopts saturated salt water. Then we'll take a look at the thermocouple welding method is what

1, thermocouple, electric arc welding method: the law will stay thermocouple wire for welding, the other is extremely high purity graphite rod, produced by the graphite electrode arc welding electric wire, in order to avoid the thermocouple wire carburizing reduce contamination, it is best to stay welding thermocouples are connected to the positive electrode of dc power supply. After welding, when welded spherical joint end quickly remove and rinse off with clear water residue on the electrode.

2, thermocouple welding method: use oxyacetylene flame welding, commonly used in industry nickel chrome - Silicon nickel, platinum, rhodium - Such as platinum thermocouple are using this method. Is the need to welding the measurement end of the thermocouple twisted rope, or the two thermocouple wire touch together, sprinkle with borax after welding, to quickly remove fused spherical, into the hot water wash immediately. Platinum rhodium - Platinum thermocouple after welding, need after annealing treatment.

3, thermocouple brine welding method: welding device, salt water in the beaker containing aqueous solution of sodium oxide, the hot electrode as a power source, take a platinum wire into the brine as the other pole, when the welding electrode contact with salt water is a bit hot, after waiting for striking quickly leave, can be welded.

the above three is a welding method of thermocouple. All know thermocouples are widely used in chemical industry, metallurgy, paper making, thermoelectric and other industrial production, and often with temperature transmitter, controller and display instrument, such as direct measurement or control in the production of a variety of 0 Fluid over a range of 1800 ℃, steam and gas medium and solid surface temperature.

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key words: thermal resistance, thermocouple, thermal resistance, platinum resistance, PT100, PT1000, pressure sensor and digital temperature sensor